Contents
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Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
78-15224-02
Spanning-Tree Interface States 6-5
Blocking State 6-6
Listening State 6-7
Learning State 6-7
Forwarding State 6-7
Disabled State 6-7
Spanning-Tree Address Management 6-8
STP and IEEE 802.1Q Trunks 6-8
Spanning Tree and Redundant Connectivity 6-8
Accelerated Aging to Retain Connectivity 6-9
RSTP 6-9
Supported RSTP Instances 6-9
Port Roles and the Active Topology 6-10
Rapid Convergence 6-11
Synchronization of Port Roles 6-12
Bridge Protocol Data Unit Format and Processing 6-13
Processing Superior BPDU Information 6-14
Processing Inferior BPDU Information 6-14
Topology Changes 6-14
Interoperability with IEEE 802.1D STP 6-15
Configuring STP and RSTP Features 6-15
Default STP and RSTP Configuration 6-16
Disabling STP and RSTP 6-16
Configuring the Root Switch 6-17
Configuring the Port Priority 6-17
Configuring the Path Cost 6-18
Configuring the Switch Priority of a Bridge Group 6-19
Configuring the Hello Time 6-19
Configuring the Forwarding-Delay Time for a Bridge Group 6-20
Configuring the Maximum-Aging Time for a Bridge Group 6-20
Verifying and Monitoring STP and RSTP Status 6-20
CHAPTER
7 Configuring VLANs 7-1
Understanding VLANs 7-1
Configuring IEEE 802.1Q VLAN Encapsulation 7-2
IEEE 802.1Q VLAN Configuration Example 7-3
Monitoring and Verifying VLAN Operation 7-5
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